Post on 03-Jan-2017
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Installation Instructions 810373-03Level Switch Type NRS 1-42
NRS 1-42
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Contents
Usage for the intended purpose ......................................................................................7Safety note ......................................................................................................................7Warning ...........................................................................................................................7
Explanatory Notes
Scope of supply ..............................................................................................................8System description ..........................................................................................................8Function ..........................................................................................................................8Technical data .................................................................................................................9
Wiring
Wiring diagram ................................................................................................3, 4, 10, 11
Basic Adjustment
CAN bus ........................................................................................................................12Node ID .........................................................................................................................12Factory setting ...............................................................................................................12Adjust sensitivity ...........................................................................................................13
Installation
Important Notes
Page
On-off control ................................................................................................................14Switchpoint 1 .................................................................................................................14Switchpoint 2 .................................................................................................................14Switchpoint 3 .................................................................................................................14Switchpoint 4 .................................................................................................................14Alarm .............................................................................................................................15High-level (MAX) alarm ...................................................................................................15Low-level (MIN) alarm .....................................................................................................15Relay test high level / low level .......................................................................................15
Operation
NRS 1-42 .......................................................................................................................10Example of installation ..................................................................................................27
Factory set default node IDs .........................................................................................23Assigning/changing node IDs .................................................................................23, 24Declaration of conformity ..............................................................................................25
Annex
Fault-finding list for troubleshooting ........................................................................21, 22
Malfunctions
Systematic analysis of malfunctions 1 – 3 ............................................................. 16 –20
System Malfunctions
3
Wiring Diagram
Fig. 2
Fig. 1
Twisted pair cable
Twisted pair cable
1) CEP = central earthing point
Control terminalURB 1
Controller. . .
Level electrodesNRG 16-42
Terminating resistor120 Ω
Power supply CAN data line
Terminating resistor120 Ω
Electrodes. . .
Level switchNRS 1-42
CEP1)
Terminating resistor120 ΩΩΩΩΩ
Relay Relay Relay Relay1 2 3 4
MAX MIN
Fill/dischargecontrol
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Wiring Diagram
Fig. 4
Fig. 3
Discharge control – Pump OFF at low level
Twisted pair cable
Twisted pair cable
Fill control – Pump OFF at high level
Terminating resistor 120 ΩΩΩΩΩ
Terminating resistor 120 ΩΩΩΩΩ
Twisted pair cable
Twisted pair cable
Pump contactor
Pump contactor
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Parts Drawing
Fig. 6
Fig. 5
A
A
B
1
7 6 5 4 3 2
6
Indicator LEDs
LED 1 – switchpoint 1
LED 2 – switchpoint 2
LED 3 – switchpoint 3
LED 4 – switchpoint 4
LED “Bus status”
LED “Power”
Enter button / test mode
Decrease button
Increase button
Program button
Code switch, 10 poles
Terminal strip
Screws for terminal strip
Key
1
3
4
6
5
7
8
A
2
B
Discharge control Fill control
High-level alarm High-level alarm
Pump ON Pump OFF
PUMP OFF Pump ON
Low-level alarm Low-level alarm
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Important Notes
Safety note
The equipment must only be installed by qualified staff.
Qualified staff are those persons who – through adequate training in electricalengineering, the use and application of safety equipment in accordance withregulations concerning electrical safety systems, and first aid & accidentprevention – have achieved a recognised level of competence appropriateto the installation and commissioning of this device.
Warning
The terminal strip of the NRS 1-42 is live during operation. This presentsthe danger of electric shock. Cut off power supply before fixing orremoving the cover.
Usage for the intended purpose
Use level switch NRS 1-42 in conjunction with level electrode NRG 16-42 only forlevel signalling in liquid and electrically conductive fluids.
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Function
At regular intervals the level electrode NRG 16-42 sends a data telegram to the levelswitch NRS 1-42. The data transfer is effected by means of a CAN bus according toDIN ISO 11898. The transferred measuring data are then evaluated and assigned tothe manually adjusted switchpoints. To guarantee the correct functioning and safetyof the system the data transmitting cycle of the level switch is constantly monitoredby the level switch. When the CAN bus line is interrupted the level switch sends avisual signal to indicate a malfunction and the relays 1 and 4 will be instantaneouslyde-energized (fail-safe position).Additional functions, such as (de-)energizing delay times of the output relays(1 to 25 seconds), can be adjusted with the control terminal and display unitURB 1.
Explanatory Notes
Scope of supply
NRS 1-421 Level switch type NRS 1-42 (plug-in unit in plastic case with terminals)1 Terminating resistor 120 Ω1 Installation manual
System description
Use level switch type NRS 1-42 together with level electrode type NRG 16-42 forlevel monitoring. The level switch has the following functions: Four levels with one switchpoint each. High-level alarm, low-level alarm, pump ON, pump OFF with one switchpoint each.The level data are transferred from the electrode NRG 16-42 to the level switch via aCAN bus.
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Technical data
Type approval n°TÜV · WR 98-399
Input / OutputInterface for CAN bus to DIN ISO 11898 CANopen
Output – voltage supply for electrodePower supply 24 V DC, short-circuit protected4 volt-free relay contacts.Max. contact rating with switching voltages of 24 V AC, 115 V AC and230 V AC: 4 A resistive, 0.75 A inductive at cos ϕ 0.5Max. contact rating with a switching voltage of 24 V DC: 4 A.Contact material: silver, hard-gold plated
Interference suppressionProvide contactor with an external RC combination (100 Ω / 47 nF)
Relay de-energizing delayOutput “MIN”, “MAX” 3 s
Indicators and adjustors4 pushbuttons for parameterisation/"TEST"1 red LED for switchpoint “HIGH LEVEL” (MAX)1 red LED for switchpoint “LOW LEVEL” (MIN)2 green LEDs for switchpoints “pump ON” and “pump OFF”1 green LED “POWER”1 red LED “BUS FAULT”1 ten-pole code switch, 7 poles for node ID and 3 poles for baud rate settings
SensitivityRange 1: ≥ 10 µS/cmRange 2: ≥ 0.5 µS/cm
Supply voltage230 V ± 10 %, 50/60 Hz115 V ± 10 %, 50/60 Hz (option)
Power consumption10 VA
ProtectionCase: IP 40 to DIN ISO 60529Terminal strip: IP 20 to DIN ISO 60529
Admissible ambient temperature0 °C to 55 °C
Enclosure materialFront panel: polycarbonate, greyCase: polycarbonate, black
WeightApprox. 0.8 kg
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UNITRONIC® is a registered trademark of LAPP Kabelwerke GmbH, Stuttgart
Wiring
Installation
NRS 1-42
Tool
Installation on mounting rail1. Clip level switch onto mounting rail 35 x 15 mm
(DIN EN 50022).2. Align level switch, fig. 11, fig. 12
Screwdriver (5.5/100)
Wiring diagram
See wiring diagrams on page 3 and 4.
Note that screened multi-core twisted-pair control cable is required, e. g. UNITRONIC®
BUS CAN 2 x 2 x ... 2 or RE-2YCYV-fl 2 x 2 x ... 2.
The baud rate (data transfer rate) dictates the cable length between the bus nodes andthe total power consumption of the measuring sensors dictates the conductor size.
The baud rate is set via a code switch. Reduce baud rate if cable is longer thanspecified in the table. Make sure that all bus nodes have the same settings.To protect the switching contacts fuse circuit with 2.5 A (anti-surge fuse) or accordingto TRD regulations (1.0 A for 72 hrs operation).When a max. cable length of 1000 m is desired, make sure to modify the baudrate accordingly. Refer to pages 23 and 24 for more details.
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Wire equipment in series. Star-type wiring is not permitted. Interlink screens of control cables such that electrical continuity is
ensured and connect them once to the central earthing point (CEP). To protect the switching contacts fuse circuit with T 2.5 A or
according to TRD regulations. If more than one system component is connected to a CAN bus network
provide the first and last equipment with a terminating resistor of 120 Ω.Fig. 2
The CAN bus network must not be interrupted while operating.
Any interruption will result in HIGH/LOW level alarm!
If the level controller must be replaced, remove terminalstrip Fig. 6.
Before removing the CAN-bus line from the terminal strip disconnect allrelevant system components.
Wiring – continued –
Attention
Note
Connect screen only to terminal 3, ensuring electrical continuity andconnect it once to the central earthing point (CEP).
The loop resistance must be under 10Ω. The rated voltage is stated on the name plate. When switching off inductive loads, voltage spikes are produced that
may impair the operation of control and measuring systems. Inductiveloads should therefore be provided with commercial arc suppressorRC combinations, e. g. 0.1 µF/100 Ω.
In spite of correct wiring H. F. interference caused by the installation maylead to system breakdowns and malfunction messages. If necessaryrefer to the “Fault finding list for troubleshooting” on page 21.
Tool
Screwdriver for slotted screws, size 2.5, completely insulated according toVDE 0680.
A
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Node-ID
CAN Bus
All level and conductivity controllers and associated electrodes are interconnected bymeans of a CAN bus using the CANopen protocol. Every item of equipment featuresan electronic address (node ID). The four-core bus cable serves as power supply anddata highway for high-speed data exchange.The CAN address (node ID) can be set between 1 and 123.The NRS 1-42 is configured at our works and ready for service with other GESTRAsystem components without having to set the node ID.If several systems of the same kind are to communicate in one CAN busnetwork, be sure to assign one node ID for each individual system component.Refer to pages 23 and 24 for more details.
Basic Adjustments
Factory setting
Baud rate: 250 kb/s Sensitivity: 10 µS/cm Node ID: 020
The level switch features the following factory set default values:
Relay with energizing delay switchpoint 1: 0s Relay with energizing delay switchpoint 4: 0s
Relay with de-energizing delay switchpoint 1: 3s Relay with de-energizing delay switchpoint 4: 3s
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Basic Adjustments – continued –
Press button briefly.Sensitivity 0.5 µS/cm is selected.
Press button briefly.Sensitivity range 1 (10 µS/cm, factory-setdefault value) is activated.Use button and to switch betweensensitivity range 10 µS/cm and 0.5 µS/cm.
Adjust sensitivity 0.5 µS/cm
Press button twice briefly.Sensitivity range 0.5 µS/cm is saved.The four indicator LEDs signal thepresent operating mode.
Press button briefly.Note:When in program mode in the event of asystem malfunction the LED “Bus status”and/or the LED “Power” flash rapidly.Quit program mode and analyse systemmalfunction (see pages 16 – 18).
LED illuminated
LED Powerbriefly
briefly
LED illuminated
LED flashes
briefly
LEDs indicate present operating mode
twice briefly
LEDs flash slowly
LEDs flash slowly
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Operation
Switchpoint 2
Switchpoint 1
Switchpoint 1 reached Time delay activated, LED 1 flashing Time delay elapsed, LED 1 permanently illuminated, relay 1 de-energizedLevel below switchpoint 1 LED 1 goes out, relay 1 energized
Switchpoint 2 reached Time delay activated, LED 2 flashing Time delay elapsed, LED 2 permantently illuminated, relay 2 energizedLevel below switchpoint 2 LED 2 goes out, relay 2 de-energized
Switchpoint 3
Level below switchpoint 3 Time delay activated, LED 3 flashing Time delay elapsed, LED 3 permantently illuminated, relay 3 energizedSwitchpoint 3 reached LED 3 goes out, relay 3 de-energized
Switchpoint 4
Level below switchpoint 4 Time delay activated, LED 4 flashing Time delay elapsed, LED 4 permanently illuminated, relay 4 de-energizedSwitchpoint 4 reached LED 4 goes out, relay 4 energized
ON-OFF Control
The setpoint range of the liquid level isreached when electrode tips 3 and 4 aresubmerged and electrode tips 1 and 2 areexposed.Note: All LEDs go out once the setpoint isreached.
LED “Power”
LEDs indicate present operating mode
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Alarm
There are two alarm conditions: High-level (MAX) alarm Low-level (MIN) alarm
LED 1 flashes rapidly.LED 1 remains permanently illuminatedafter the de-energizing delay.
LED 4 flashes rapidly.LED 4 remains permanently illuminatedafter the de-energizing delay.
High-Level (MAX) Alarm
Low-Level (MIN) Alarm
Hold down button .LED 4 goes out.A low-level (MIN) alarm is simulated forswitchpoint 4.
Press button briefly.The test mode is activated for 5 seconds.
Relay Test MIN/MAX
Indicator LED 4 goes out
LEDs illuminated
briefly
Hold down button .LED 1 goes out.A high-level (MAX) alarm is simulated forswitchpoint 1.
Indicator LED 1 goes out
illuminatedflashes
flashes illuminated
Operation – continued –
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System Malfunctions
There are four system malfunctions that might occur in the level switch and the levelelectrode: Max. admissible temperature in electrode terminal box exceeded No or faulty communication between controller and electrode Fault in CAN bus Failure of 24 V power supply unit built in level switch NRS 1-42
The terminal strip of the NRS 1-42 is live during operation.This presents the danger of electric shock.Cut off power supply before mounting or removing the equipment.
Danger
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System Malfunctions – continued –
The sources of malfunctions occurring in CAN bus systems operating with severalbus-based stations must be analysed systematically since faulty components orincorrect settings can give rise to negative interactions with intact bus devices in theCAN bus system. These unwanted interactions can cause error messages in fullyfunctional bus devices, which will make fault detection even more difficult.
We recommend the following systematic fault finding procedure:
Systematic Malfunction Analysis
Step 1 (Start)Detach terminal stripsin all sensing units ofbus nodes.
Level electrodeConductivity electrodePressure sensorTemperature sensor
CheckUse fault-findinglist to correctfault(s).
Final test:have all faultsbeen eliminated?
Step 2Plug in terminal stripof the bus nodes, e. g.NRS ...andNRG ... (sensor)
SystemMalfunctionUse fault-finding listto identify thefault(s).
Cut off power supplyto the equipment.
Step 3Apply mains voltageto bus nodes, e. g.NRS ...andNRG ...
System O.K.Detach terminalstrips betweenbus nodes e. g.NRS ...andNRG ...
Check next system
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System Malfunctions – continued –
The terminal strip of the NRS 1-42 is live during operation.This presents the danger of electric shock.Cut off power supply before mounting or removing the equipment.
Danger
The four indicator LEDs flash slowly.MAX/MIN alarm
System Malfunction 1
LEDs flash slowly
Fault: The max. admissible temperature in the electrode terminal box is exceeded.Remedy: Insulate electrode flange to protect the equipment against heat radiation.
The four LEDs flash rapidly.MAX/MIN alarm
System Malfunction 2
LEDs flash rapidly
As soon as the temperature drops below the max. admissible limit the equipmentautomatically returns to normal operation.
Fault: The CAN bus line between the nodes is interrupted.Remedy: Check wiring and terminals. Restart system.
Fault: Incorrect node ID settings.Remedy: Set correct node ID(s), referring to sections “Basic Adjustment” and “Annex”.
Disconnect the system from its power supply. After 5 sec. connectpower and restart system.
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LED “Bus status” flashes slowly.
System Malfunction 4
System Malfunctions – continued –
Fault: Data transfer in CAN bus interrupted.Remedy: The bus cables have to be correctly connected according to the wiring
diagram (observe polarity!). Make sure that all end-of-line nodes areprovided with 120 Ω terminating resistors. Disconnect the system from itspower supply. After 5 sec. connect power and restart system.
Fault: Malfunction in CAN bus.Remedy: Restart system.
Fault: The baud rate of one or more nodes is not set correctly.Remedy: Check baud rate settings of all bus nodes. The baud rates must be
identical. Refer to section “Annex” for more details. Disconnect the systemfrom its power supply. After 5 sec. connect power and restart system.
Fault: The overall length of the bus cable does not correspond to the selectedbaud rate.
Remedy: Change baud rate settings of all nodes according to the ratings indicatedin section “Annex”. Disconnect the system from its power supply. After 5sec. connect power and restart system.
LED “Bus status” flashes slowlyMAX/MIN alarm
System Malfunction 3
Fault: The plausibility test shows that the low level electrode ends above highlevel.
Remedy: Check electrode tips and, if necessary, correct the assignment of theconnectors on the preamplifier board of the electrode.
LED flashes slowly
The four indicator LEDs flash slowly. LED flashes slowly
LED flashes slowly
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System Malfunction 5
LED flashes slowly
System Malfunctions – continued –
LED “Power” flashes slowly.
Fault: The power supply unit (PSU) is overloaded. The power supply unit maybe misused for other components.
Remedy: Check load of power supply unit. Be sure to use the PSU only for thevoltage supply of network components.Disconnect the system from its power supply. After 5 sec. connect powerand restart system.
Fault: Power supply unit fails to function.
Remedy: Replace PSU.
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Fault finding list for troubleshooting
The terminal strip of the NRS 1-42 is live during operation.This presents the danger of electric shock.Cut off power supply before mounting or removing the equipment.
Danger
Device fails to work – no function
Fault: LED “Power” does not light up.Remedy: Turn on the power. Connect the equipment in accordance with the wiring
diagram.
Switchpoints reached / level below switchpoints – no function
Fault: The electrode body does not have earth connection to the vessel.Remedy: Clean seating surfaces and insert metal joint ring (of stainless steel 1.4301)
D 33 x 39 to DIN 7603.Do not insulate the level electrode with hemp or PTFE tape!
Fault: The electric conductivity is too low.
Remedy: Set sensitivity to ≥≥≥≥≥ 0.5 µS/cm.
Fault: The isolating valves of the external measuring pot (optional item) areclosed.
Remedy: Open isolating valves.
Fault: The vent hole in the protection tube does not exist, is obstructed or flooded.Remedy: Check protection tube and, if necessary, provide vent hole.
Malfunctions
Device fails to work – indication of malfunction
Fault: In spite of correct wiring and commissioning of the equipment aninterference signal is indicated.
Remedy: The interference signal is caused by H. F. interferences coming from theinstallation. For interference suppression of the voltage supply we supplyferrite rings, stock code 147253. The 230 V supply lines should belooped through the ferrite ring five to ten times. If several controllers areused in the system, they can be fed from the interference suppressedsupply lines. For the interference suppression of the bus line we supplyhinged-shell ferrite rings, stock code 147254. The hinged-shell ferriterings are clamped onto the bus line close to the terminal strip of thecontroller.Restart the system after installation.
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If faults occur that are not listed above or cannot be corrected, please contact ourservice centre or authorized agency in your country.
Malfunctions – continued –
Fault finding list for troubleshooting – continued –
Fault: The switching function has not been correctly allocated.Electrode rods have been cut to the wrong size.
Remedy: Identify electrode supply wires and reconnect the circuit board in theterminal box accordingly.
Switchpoints reached / level below switchpoints – incorrect function
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Annex
Danger
The terminal strip of the NRS 1-42 is live during operation.This presents the danger of electric shock.Cut off power supply before mounting or removing the equipment.
Factory set default values of node IDs
The individual node IDs must be manually adjusted on the equipment.Please observe the installation instructions of the device in question.
Switchingcontroller
Level electrode
Fig. 7
Attention
Do not assign the same node ID twice within the CAN bus network.
Assigning /changing node ID
If several systems of the same kind are to communicate in one CAN bus network, besure to assign one node ID for each individual system component (e. g. controller).
Detach terminal strips in order to change the code switch settings .A 8
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Annex – continued –
OFFNode ID
S1 1ONS2 2ONS3 4OFFS4 8OFFS5 16OFFS6 32ONS7 64
OFFNode ID
S1 1OFFS2 2ONS3 4OFFS4 8ONS5 16OFFS6 32OFFS7 64
20 70
Fig. 8 (Factory setting) Fig. 9 (Example)
Baud rateS8 S9 S0250 kBit/s
Cable length125 mOFFONOFF
OFF 125 kBit/sONON 250 mON 100 kBit/sOFFOFF 335 mON 50 kBit/sOFFON 500 mON 20 kBit/sONOFF 1000 mON 50 kBit/sONON 1000 m
Fig. 10 (Factory setting: 250 kBits/s)
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We hereby declare that the equipment NRS 1-42 conforms to the following Euopeanguidelines: LV guideline 73/23/eec version 93/68/eec EMC guideline 89/336/eec version 93/68/eecwhich are based on the following harmonised standards: LV standard DIN EN 50178 EMC standard DIN EN 50 081-2, DIN EN 610 00-6-2This declaration is no longer valid if modifications are made to the equipment withoutconsultation with us.
Declaration of conformity
Annex – continued –
Bremen, 23rd July 2002GESTRA GmbH
Quality Assurance ManagerLars Bohl
(Academically qualified engineer)
Head of the Design Dept.Uwe Bledschun
(Academically qualified engineer)
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Terminal strips
Supporting rail 35 x 15 to DIN EN 50022
Key
A
C
27
100
73
118
Example of Installation
Fig. 11
Fig. 12
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28810373-02/304cm · © 2000 GESTRA GmbH · Bremen · Printed in Germany
GESTRA GmbHPostfach 10 54 60, D-28054 Bremen, Münchener Str. 77, D-28215 BremenTelefon +49 (0) 421 35 03 - 0, Telefax +49 (0) 421 35 03 - 393E-Mail gestra.gmbh@flowserve.com, Internet www.gestra.de
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